<template>
    <el-container>
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 左侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <!-- 控制菜单的折叠 -->
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 -->
                <el-menu :default-active="activePath" router :collapse-transition="false" :collapse="isCollapse" unique-opened 
                background-color="#333744" text-color="#fff" active-text-color="#409eff">
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <!-- path没有以/开头，加一个/ -->
                        <el-menu-item :index="'/' + subItem.path" @click="saveNavState('/' + subItem.path)"
                        v-for="subItem in item.children" :key='subItem.id'>
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧内容区域 -->
            <el-main>
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
    export default {
        data() {
            return {
                //左侧菜单数据
            menulist: [],
            iconsObj: {
                '125': 'el-icon-user-solid',
                '103': 'el-icon-s-release',
                '101': 'el-icon-shopping-cart-1',
                '102': 'el-icon-document-add',
                '145': 'el-icon-s-help'
            },
            isCollapse: false,
            //被激活的连接地址
            activePath: ''
            }
        },
        created(){
            this.getMenuList()
            this.activePath = window.sessionStorage.getItem('activePath')
        },
        methods: {
            logout() {
                //清空sessionStorage
                window.sessionStorage.clear()
                //重定向到登录页面
                this.$router.push('/login')
            },
            //获取所有菜单
            async getMenuList() {
                const {data: res} = await this.$http.get('menus')
                //获取失败，返回错误信息
                if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
                //获取成功，把data数组数据赋给menulist
                this.menulist = res.data
                console.log(res);
            },
            //是否折叠
            toggleCollapse() {
                this.isCollapse = !this.isCollapse
            },
            //保持连接的激活状态
            saveNavState(activePath) {
                window.sessionStorage.setItem('activePath', activePath)
                this.activePath = activePath
            }
        }
    }
</script>

<style lang="less" scoped>
    .el-container {
        height: 100%;
    }

    .el-header {
        background-color: #373d41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #ffffff;
        font-size: 20px;

        >div {
            display: flex;
            align-items: center;

            span {
                margin-left: 15px;
            }
        }
    }

    .el-aside {
        background-color: #333744;
        .el-menu{
            border-right: none;
        }
    }

    .el-main {
        background-color: #eaedf1;
    }

    .toggle-button{
        background-color: #4a5064;
        font-size: 10px;
        line-height: 24px;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }

</style>